FIELD: physics.
SUBSTANCE: invention relates to masking loss of audio decoder. For this purpose, sign changes in the modified discrete cosine transform (MDCT) coefficients in the received frames are analyzed by determining the number of sign changes between the corresponding MDCT coefficients in the sub-vectors of successive error-free frames not containing the transient process, each sub-vector comprising frequency band factors; accumulating number of sign changes in corresponding bands of consecutive frames; and reconstructing the lost frame by copying the MDCT coefficients from the preceding frame, but with the MDCT coefficient reverse signs in the bands having the accumulated number of sign changes greater than the predetermined threshold.
EFFECT: technical result is improved masking of errors in frames due to absence of transmission of additional third-party parameters or formation of additional delays required by interpolation.
10 cl, 16 dwg, 1 tbl
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| DEVICE AND METHOD FOR MASKING ERRORS IN STANDARDIZED CODING OF SPEECH AND AUDIO WITH LOW DELAY (USAC) | 2012 |
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RU2630390C2 |
| CLASSIFICATION AND CODING OF AUDIO SIGNALS | 2015 |
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RU2668111C2 |
